Modeling the hydraulic excavation of cohesive soil by a moving vertical jet

Wang, Boyao; Rhee, Cees van; Nobel, A. J.; Keetels, Geert

doi:10.1016/j.oceaneng.2021.108796

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Diversos autores estudaram o processo de fluidização do solo ao longo dos anos em áreas como dragagem, rebaixamento de barras em bocas de canais ou estuários [e.g. [7][8][9][10][11][12]. Também foram realizados estudos dos efeitos da aplicação de jatos verticais de água em solos granulares, conforme [e.g.…”

Section: Introductionunclassified

Ensaios de campo de penetração auxiliada por jatos de água de modelos de estacas torpedo em solo granular

Vasconcelos Rocha,

De Freitas Fagundes,

Retzlaff Camargo

2023

Sci. Plena

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O presente trabalho apresenta os resultados de ensaios de instalação de âncoras do tipo estaca torpedo em escala reduzida auxiliada pelo processo de fluidização feita através da aplicação de jatos de água verticais circulares. Foi avaliada a influência da vazão imposta e a massa do elemento ancorante. O protótipo analisado foi um modelo de estaca torpedo T66 de 66 toneladas. Os ensaios foram executados em um campo experimental de solo arenoso com modelos reduzidos na escala de comprimento 1:12, de acordo com a Lei de Semelhança pelo Número de Froude. Os estágios de vazão aplicada foram de 10,35, 22,81, 30,71 e 41,60 L/min. Os resultados dos ensaios demonstraram bastante concordância com pesquisas semelhantes realizadas em laboratório com escalas menores que a avaliada neste trabalho. Observou-se que o aumento da vazão aumentou a profundidade de penetração dos modelos, assim como para uma dada vazão, a estaca com maior massa tem maior penetração. Os ensaios mostraram que o processo de fluidização contribui para aumento das profundidades desse tipo de sistema de ancoragem offshore e que a correta escolha da vazão e da massa da estaca torpedo podem trazer melhorias no procedimento de instalação.

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Section: Introductionunclassified

Ensaios de campo de penetração auxiliada por jatos de água de modelos de estacas torpedo em solo granular

Vasconcelos Rocha,

De Freitas Fagundes,

Retzlaff Camargo

2023

Sci. Plena

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“…However, these results cannot be used directly for Equatorial Guinea deep water conductor setting depth designing. The soil strength recovery characteristic is also related to the jet excavation during the conductor jetting process [8,13].…”

Section: Introductionmentioning

confidence: 99%

Modified Model for Shallow Soil Strength Recovery Calculation during Set-Up Periods of Jetted Conductor—A Case Study of Equatorial Guinea Bay Deep-Water Drilling

et al. 2021

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Jetted conductor setting depth is crucial for deep-water drilling. This paper presents an innovative method for determining the shallow soil resistance strength recovery factor based on the field data of Equatorial Guinea bay. It shows that the soil strength recovery factor of Equatorial Guinea bay is lower than that of the Gulf of Mexico. The conductor setting depth calculation referring to other place will have a high risk of wellhead sinking. According to the newly established designing charts, the conductor setting depth was recommended for the S1 well. Each preferred set-up period requires a specific setting depth. If the chosen set-up period is 2 days, the expected setting depth of a 36″ conductor should be 250 ft (76.2 m) and, similarly, 295 ft (89.9 m) for a 30″ conductor. The relationship between set-up period and surface conductor setting depth is established as well. Wellhead landed load appears to be the crucial factor for determining the conductor setting depth. The rationality of the newly developed shallow soil strength recovery model for the Equatorial Guinea deep-water block was also confirmed by the field data.

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“…In the first type, numerical models apply computational fluid dynamics (CFD) software for computing the fluid motion only above the bed [1,[25][26][27]. The second modeling framework is based on two-phase approaches, in which the motion equations solve both solid and fluid phases [28][29][30][31][32][33][34][35].…”

mentioning

confidence: 99%

“…On the other hand, in the Eulerian-Eulerian framework, clear fluid and solid particles are treated as two interpenetrating fluids. The fluid-particle and particle-particle interactions are described at the scale of the continuum media [32][33][34][35]. However, if only a liquid-like behavior of solid particles is modeled to handle the motion of the granular phase for the jet problem, the sediment motion becomes unrealistic, particularly in the jammed region [32,33].…”

mentioning

confidence: 99%

“…Therefore, solid-like and liquid-like behaviors of sediment are essential and need to be considered for more accurate models. In recent years, few efforts have been performed to include this property in the Eulerian approach; for example, Yuan et al [33] applied an incipient motion theory in their numerical simulations, Uh Zapata et al [34] proposed a modified inter-phase momentum transfer formulation, and Wang et al [35] used a model for the solid-fluid mixture combined with a viscoplastic description of soil. Consequently, this paper proposes a unified formulation for continuum mechanics to simulate vertical-jetinduced erosion with a unique local parameter governing the solid/liquid transition for the sediment.…”

mentioning

confidence: 99%

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Two-Phase Flow Modeling for Bed Erosion by a Plane Jet Impingement

Bang

Zapata

Gauthier

et al. 2022

Water

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This paper presents experimental and numerical studies on the erosion of a horizontal granular bed by a two-dimensional plane vertical impinging jet to predict the eroded craters’ size scaling (depth and width). The simulations help understand the microscopic processes that govern erosion in this complex flow. A modified jet-bed distance, accounting for the plane jet virtual origin, is successfully used to obtain a unique relationship between the crater size and a local Shields parameter. This work develops a two-phase flow numerical model to reproduce the experimental results. The numerical techniques are based on a finite volume formulation to approximate spatial derivatives, a projection technique to calculate the pressure and velocity for each phase, and a staggered grid to avoid spurious oscillations. Different options for the sediment’s solid-to-liquid transition during erosion are proposed, tested, and discussed. One model is based on unified equations of continuum mechanics, others on modified closure equations for viscosity or momentum transfer. A good agreement between the numerical solutions and the experimental measurements is obtained.

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Modeling the hydraulic excavation of cohesive soil by a moving vertical jet

Cited by 9 publications

References 25 publications

Ensaios de campo de penetração auxiliada por jatos de água de modelos de estacas torpedo em solo granular

Ensaios de campo de penetração auxiliada por jatos de água de modelos de estacas torpedo em solo granular

Modified Model for Shallow Soil Strength Recovery Calculation during Set-Up Periods of Jetted Conductor—A Case Study of Equatorial Guinea Bay Deep-Water Drilling

Two-Phase Flow Modeling for Bed Erosion by a Plane Jet Impingement

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